Molecular Physics | Thermodynamics Answers

When a heating coil is immersed in melting ice, the ice melts at a rate of 10grams per minute. If the current in the coil is doubled while its resistance remains constant, the mass of ice that will melt per minute is?

Transverse waves can be distinguished from longitudinal waves using

A.Polarisation B. refraction C. reflection D. diffraction E.Luminosity F. Dispersion

Which of these physical quantities has base units kgm2s-2?

A. Pressure B. Energy C. Power D. Momentum

Intensity is defined as power per unit area, What is the units of intensity?

The magnitude of the acceleration of an object moving along a straight line is equal to the?

A. slope of the displacement time graph

B. Area below the force-time graph

C. Slope of its velocity-time graph

D. Area under its velocity-time graph

If the engine of a car of mass m is capable of power P, the minimum time needed for the car to accelerate from rest to a speed v is?

 1-Kilowatt power was transmitted through a transmission line at 1100 Volts. If transmission line has a resistance of 5 ohm, then power loss due to heat will be approximately:

An audio speaker producing a steady sound at an outdoor concert is 20 ft away from you. If you move to a position where the speaker is 63 ft distant, by what factor will the amplitude of the sound change?

Solar radiation from the sun (T=5500K) heats an asphalt driveway on a summer day. The driveway has dimensions of 4.0 x 15 m. If the asphalt driveway behaves like a black body with emissivity of 1,

a)determine the amount of heat that the driveway absorbs in 1 hour.?

b) If the surface temperature of the driveway in part (a) reaches a temperature of 38C, determine how much heat it will emit in 1 hour. Is your answer the same or different as in part a)?